<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        /* 
          slice()
          有三个或多个参数时，替换元素
          语法：
           数组名.splice(start[,num,ele...]);
           start:第一个值为插入元素的位置
           num:第二个值为替换的个数
           ele...:被替换的元素
        */
       let arr = [0,1,2,3,4,5];

       let arr2 =arr.splice(2, 2, "张飞", "牛肉", "手机", "鼠标");
       console.log(arr,arr2);

    //   如果第二个值为零，则不替换，直接插入6，7，8；

    let arr3 =arr.splice(2,0,1,5,4,3,2);
    console.log(arr,arr3);
    </script>
</body>
</html>